What is inside calcium carbonate?

Answer 1

CaCO3 + H2CO3(aq) -> CaCO3 + H2CO3(aq)

There is nothing to drive any sort of reaction at conditions near STP. At elevated temperatures such as would be found in a cement kiln, the calcium carbonate would decompose to calcium oxide and carbon dioxide while the carbonic acid would have long since evaporated to give water vapor and carbon dioxide.

Answer 2

Lack of calcium can cause osteoporosis. Calcium carbonate contains calcium so it will help your bones and could prevent osteoporosis.

Answer 3

Calcium ions (Ca 2+), and carbonate ions (CO3 2-). A carbonate ion is made up of a carbon atom surrounded by 3 oxygen atoms.